Thermodynamic assessment of Ag–Dy–Sb ternary system

Abstract

Thermodynamic description of the Ag–Dy–Sb ternary system has been performed. At first, the boundary binary Dy–Sb system has been thermodynamically assessed with CALPHAD method. The solution phases including liquid, Bcc and Hcp were described with a substitutional model, of which the excess Gibbs energies were formulated with the Redlich–Kister polynomial. All the binary intermetallic phases, i.e. Dy 5Sb 3, Dy 4Sb 3 and DySb, were treated as stoichiometric compounds. Then, combined with the thermodynamic parameters of the Ag–Dy and Ag–Sb binary systems cited from literatures, the Ag–Dy–Sb ternary system was thermodynamically assessed. The calculated phase equilibria were in good agreement with the reported experimental data.